Heat Panini press (or pan) according to manufacturers directions.
Spread Nutella on each slice of bread. Sprinkle graham cracker crumbs on top of the Nutella on one slice. Place two marshmallows on top of graham cracker crumbs, and top with second slice of bread (Nutella side facing the inside of the sandwich).
Heat in panini press until desired level of brown is reached. Remove from press, slice and serve. Be careful, it will be hot. Enjoy and share with a friend to spread some happy